Stella is MP for the Walthamstow parliamentary constituency. It contains most of the Walthamstow area plus part of Highams Park, as shown on the map above. The area to the north of the constituency is the Chingford & Woodford Green constituency, represented by Iain Duncan Smith MP. The area to the south of the constituency is the Leyton & Wanstead constituency, represented by John Cryer MP. Strict parliamentary protocol means that Stella can only take up cases from residents of her own constituency. Walthamstow is entirely within the London Borough of Waltham Forest.
Walthamstow is divided into eight wards, each represented by three councillors.